My belly is making it hard to get around?

I never thought I would get so fat, I don't know how to start losing it. My belly is starting to really feel heavy in front of me when I'm standing, luckily I have an office job, where I'm sitting so my thighs can support my belly fat. I don't know how to even start exercising im so unfit.
My belly is making it hard to get around?
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